1. Kernforschungsanlage Jülich GmbH Institut für Reaktorwerkstoffe, Postfach 1913, 5170 Jülich Federal Republic of Germany
2. Section d’Etudes de Metallurgie Department de Metallurgie, Grenoble, France
3. Oak Ridge National Laboratory Metals and Ceramics Division, Oak Ridge, Tennessee 37830
4. General Atomic Company, P.O. Box 81608 San Diego, California 92138